Valve tappet for internal-combustion engines



Juy w, w23 mmm@ G. R. RICH VALVE TAPPET FOR INTERNAL COMBUSTION 'ENGINES Filed Sept. 23. 19.22

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Patented July lill), i923.

narran stares lha-@1,5% PATENT @FFIQEG' GEORGE R. RICH, OF` LOS ANGELES, CALIFORNIA.

VALVE TAPPET FOR INTERNAL-COMRUSTION ENGINES.

Application ledseptember 23, 1922. Serial No. 520,026.

To all/whom t may concern Be it known -that I, GEORGE R. RICH, a

citizen of the United States, and a resident.

of Los Angeles, Los Angeles County, and State of California, have invented certain new and useful Improvements in Valve Tappets for Internal-Combustion Engines, of which the following is declared to be a full, clear, and exact description. j

This invention relates to valve tappets forv internal combustion engines, and. its principal object is to provide means for compensating for any misalignment of the cam shaft, or the tappets of internal combustion engines, whereby they cams may contact squarely across the faces of the tappet heads.

Much diiiiculty has been encountered in the cam shaft and tappet assemblies, due to the fact that it is practically impossible to grind the cam shafts perfectly true, and like-wise practically impossible to install the cam shafts perfectly true, owing Ato slight misalignment of the bearings. The greatest difiiculty arises in installing the tappets in true relation to the cam shaft-that is to say in installing them at-perfect right angles to Vthe cam shaft. When it is realized that the bushing in which the tappet moves, must have some clearance when inserted, there is no assurance that it is at a perfect rightA angle to the cam shaft when tightened in place. The result is that when the cam shaft and a tappet are not accurately'located at right angles to each other, one extreme corner of the cam only, engages the'tappet and causes the same to wear away rapidly, especially where it will operate in one position for some length of time. Often it wears a depression in the face of the tappet, and when the tappet turns around in its bushing, a high place is presented to the cam, causing improper adjustment between the valve and tappet.

In accordance with the present invention, I provide a tappet head which is capable of angular movement relative to the body or stem of the tappet, whereby the head may align itself properly with respect to the cam, so that the full face of the latter may bear against the face of the tappethead, ir-

f respective of any slight misalignment of the cam shaft or tappet. This I have accomplished by swiveling the head upon the tappet body'or stem on a line running crosswise of the axis of the cam shaft whereby the face of the tappet head may assume a plane parallel with the axis of the cam shaft despite any misalignment o-f the cafn shaft or tappet body.

The invention consists in a tappet having a head separate from the body and swiveled thereto on a line running crosswise of the cam shaft, whereby the cam may track squarely across the faceof said tappet head. The invention further consists in the several novel features hereinafter fully set forth and claimed.

The invention is clearly illustrated in the drawing accompanying this specification, in which:

Fig. 1 is a view partly in side elevation and partly in central, verticalI section of a valve tappet assembly and fragment of al cam shaft` illustrating one embodiment of the invention; Fig. 2 is avertical section,

taken on line 2-2 of Fig. l and showing the bushing and a part of the tappet in elevation; Fig. 3 is a cross section taken on the line 3-3 of Fig. 1, and Fig. 4 isa'side elevation of the tappet.

Referring to said drawing, the reference character 10 designates a fragment of a cam shaft of an internal/combustion engine, and 11 designates one ofthe cams thereonl4 Above the cam, and extending approximately at right angles to the cam shaft is a bushing 12 which is stationarily secured inthe motor block (a) as usual. These parts are well known and require no particular description so far as this specification is concerned.

Extending through the bore of the bushing is the tappet body or stem 14 which, in the form illustrated, is centrally bored and tapped as usual for the reception of the 'adjusting stud (not shown)i The tappet head 15 is formed of a separate piece of material and has the usual disk like head portion 16 formed with a flat face 17 that is engaged by the cam face 18 of the cam 11. The tappet head 15 is swiveled or otherwise con- `nected tio the body 14 in such'manner as to admit of angular' movement of the head with respect to the body, and as shown, the body is centrally slotted lengthwise of yitself, to leave furcations or forks 19, between which is an ear or lug 20 formed on the head portion 16. A pin 21 extends through apertures in the forks 19, and ear or lug 20 and pivotally connects the head with t-he body. To prevent the tappet from turning in its bushing, the lower end portion fof the bushing is slotted lengthwise of itself to leave furca tions or forks 22, and the' ear or lug 2O is made a trifle wider than the body portion held by said forks '22 against turning in the bushing. j

In operation the tappet is held ldown against the cam by the valve s ring (not shown) as is well understood. body or stein I4 is not located precisely at right angles to the cam shaft, the tappet head adjusts itself, under the influence of the cam, sc .that the face oflthe headis brought parallel with the face of the cam, thereby permitting across the face of the tappet. The wear on the' faces of the cam and tappet lhead is spread over the entire contacting lsurfaces and the possibility of cutting grooves in the head is thereby eliminated. More or less variation of of construction is possible without departing from the spirit of this invention; I desire, therefore, not to limit myself to Vthe exact form of the construction shown and described, but intend, in the following claims, to point out lall of the invention disclosed herein.

I claim as new and desire to secure by Letters Patent: 'l j l. A valve tappet, comprising a tappet body anda separate tappet head swiveled thereto on a line running crosswise of an associated cam shaft, whereby the head may adjust itself toV engage the cam squarely across its face 2'. A valve tappet, comprisinga tappet body and a separate tappet head movable relative to the body in a plane parallel to the axis of an associated cam shaft, whereby the head may adjust itself to engage an associated cam squarely across the face of the cam. l

3. A valve tappet, comprising a tappet body and a separate tappet head fulcrumed body,

n case the the cam to track squarely the exact details thereon on a line running crosswise of an" associated cam shaft, whereby said head may adjust itself to engage an associated ca'm squarely across-its face thereof.`

4. Av valve tappet, comprsinga tappet'I a separate tappet head, and a pivot pin connectingl said body'and `head, said pivot pin extending crosswise ofan` associated vcam shaft. 5. A valve tappet, comprising a tappet body forked at its lowerend, a tappet head having an ear located between said forks, and a pivot pin extending through said forks and ear, said pin extending crosswise of an associated cam shaft.

6. A valve tappet, 'comprising a tappet body and a separate tappet Ahead swiveled thereto on a line running crosswise of. an

associated cam shaft, whereby the head may adjust itself kto engage the cam squarely' across'its face, and means for securingr said tapp'et against rotation.

7. A valve tappet, comprising a tappet body, a separate tappet head and a pivot pin connectin .said body and head, said pivot pin exten ing crosswise of an associate cam Ishaft and means for securing said tappet against rotation.

8. A tappet assembly, comprisinga bushing, a tappet mounted thereinand having a separately ing and tappet bodyand pivotally connected to said tappet body on a line running crosswise of an associated cam shaft.

GEORGE R. :aioiij formed disc like head lswiveled thereto on an `axis running crosswise of an, associated camshaft, and coacting means be-4 tween the bushing and tappet for preventing f 

